Biexcitonic optical Stark effects in monolayer molybdenum diselenide

Yong, Chaw-Keong; Horng, Jason; Shen, Yuxia; Cai, Hui; Wang, Alex; Yang, Changjiang; Lin, Chung Kuan; Zhao, Shilong; Watanabe, Kenji; Taniguchi, Takashi; Wang, Feng

doi:10.1038/s41567-018-0216-7

Cited by 58 publications

(71 citation statements)

References 30 publications

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“…The interest in monolayer and few-layer S-TMDs and other 2D materials results from their unique electronic and optical properties 31 as well as their mutual compatibility, which opens up the possibility of stacking them to form artificial crystals with tailored properties 32 . The S-TMDs, with a non-zero bandgap, are particularly well suited for optical applications, including optoelectronic sensors and light emitters [33][34][35][36][37][38] . We decided to use two popular representatives of the S-TMD family, namely, monolayer WSe 2 and monolayer MoSe 2 .…”

Section: Applications In Spectroscopymentioning

confidence: 99%

Ultra-long-working-distance spectroscopy of single nanostructures with aspherical solid immersion microlenses

et al. 2020

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In light science and applications, equally important roles are played by efficient light emitters/detectors and by the optical elements responsible for light extraction and delivery. The latter should be simple, cost effective, broadband, versatile and compatible with other components of widely desired micro-optical systems. Ideally, they should also operate without high-numerical-aperture optics. Here, we demonstrate that all these requirements can be met with elliptical microlenses 3D printed on top of light emitters. Importantly, the microlenses we propose readily form the collected light into an ultra-low divergence beam (half-angle divergence below 1°) perfectly suited for ultra-longworking-distance optical measurements (600 mm with a 1-inch collection lens), which are not accessible to date with other spectroscopic techniques. Our microlenses can be fabricated on a wide variety of samples, including semiconductor quantum dots and fragile van der Waals heterostructures made of novel two-dimensional materials, such as monolayer and few-layer transition metal dichalcogenides.

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Section: Applications In Spectroscopymentioning

confidence: 99%

Ultra-long-working-distance spectroscopy of single nanostructures with aspherical solid immersion microlenses

et al. 2020

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“…1a, b) produced by photoexcitation. Photoexcitation perturbs excitons [8][9][10][11][12][13] prompting changes of the complex wavevector, q p , where the subscript p indicates that q p is obtained in the "photo-excited" state. Our waveguide imaging data ( Figs.…”

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confidence: 99%

Femtosecond exciton dynamics in WSe2 optical waveguides

et al. 2020

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Van-der Waals (vdW) atomically layered crystals can act as optical waveguides over a broad range of the electromagnetic spectrum ranging from Terahertz to visible. Unlike common Sibased waveguides, vdW semiconductors host strong excitonic resonances that may be controlled using non-thermal stimuli including electrostatic gating and photoexcitation. Here, we utilize waveguide modes to examine photo-induced changes of excitons in the prototypical vdW semiconductor, WSe 2 , prompted by femtosecond light pulses. Using timeresolved scanning near-field optical microscopy we visualize the electric field profiles of waveguide modes in real space and time and extract the temporal evolution of the optical constants following femtosecond photoexcitation. By monitoring the phase velocity of the waveguide modes, we detect incoherent A-exciton bleaching along with a coherent optical Stark shift in WSe 2 .

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“…The second method involves all-optical control of the QD via the optical Stark control. The polarization-selective transition, |1=2i$|3=2i or | À 1=2i$| À 3=2i, can also be tuned to have different energies by inducing a large optical Start shift with a large detuned circularly polarized light [31,32]. As shown in Figure 8d, the σ þ -polarized transition is shifted by σ þ -polarized classical light to be on resonance with the CCW mode, while the σ À -polarized transition of the QD decouples to the resonator due to a large detuning Δ À ¼ Δ c þ 2Δ OSE , where Δ c is the detuning of resonator's resonance and Δ OSE is the detuning which resulted from the OSE.…”

Section: Single-photon Isolator and Circulator Based On A Wgm Microrementioning

confidence: 99%

Optical Chirality and Single-Photon Isolation

Tang¹,

Xia²

2020

Single Photon Manipulation

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Optical isolation is important for protecting a laser from damage due to the detrimental back reflection of light. It typically relies on breaking Lorentz reciprocity and normally is achieved via the Faraday magneto-optical effect, requiring a strong external magnetic field. Single-photon isolation, the quantum counterpart of optical isolation, is the key functional component in quantum information processing, but its realization is challenging. In this chapter, we present all-optical schemes for isolating the backscattering from single photons. In the first scheme, we show the single-photon isolation can be realized by using a chiral quantum optical system, in which a quantum emitter asymmetrically couples to nanowaveguide modes or whispering-gallery modes with high optical chirality. Secondly, we propose a chiral optical Kerr nonlinearity to bypass the so-called dynamical reciprocity in nonlinear optics and then achieve room-temperature photon isolation with low insertion loss. The concepts we present may pave the way for quantum information processing in an unconventional way.

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Biexcitonic optical Stark effects in monolayer molybdenum diselenide

Cited by 58 publications

References 30 publications

Ultra-long-working-distance spectroscopy of single nanostructures with aspherical solid immersion microlenses

Ultra-long-working-distance spectroscopy of single nanostructures with aspherical solid immersion microlenses

Femtosecond exciton dynamics in WSe2 optical waveguides

Optical Chirality and Single-Photon Isolation

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